Aventador uses a single-clutch gearbox, a lot easier to upgrade/keep together compared to a DCT. Only DCT I know that's holding up (and can be significantly upgraded) to withstand excessive power levels is the GTR's gearbox.

Aventador uses a single-clutch gearbox, a lot easier to upgrade/keep together compared to a DCT. Only DCT I know that's holding up (and can be significantly upgraded) to withstand excessive power levels is the GTR's gearbox.

And Then Thereís the Gearbox
The other jewel in the Aventadorís powertrain is the ISR automated manual transmission, short for Independent Shifting Rods. With a claimed shift time of 50 milliseconds (as measured by the amount of time the flow of torque is interrupted), the ISR is the fastest production transmission in the Westóand the East, for that matter. For comparison, Reggiani says that a Formula 1 car shifts in 40 milliseconds, and the fastest the Gallardo can achieve a gear swap is 120 milliseconds.
This is done while still using only one clutch. Weight, again, was a huge factor and a dual-clutch was deemed too heavy. As it is, Lamborghini says the new transmission represents a 26-pound weight savings. So how does it change gears? Despite the single clutch, the idea is similar to a dual-clutch. In a conventional manual transmission, gears are stacked on a shaft in order. A four-speed, for instance, has first and second on one shaft and third and fourth on another shaft
This also is where the independent shifting rods come in; the ISR transmission has four shifting rods to carry out the work (the aforementioned old-fashioned four-speed gets by with two). Further helping the speed is the lack of any external hydraulic lines. By making the pressurized lines part of the housing casting, Lamborghini eliminated any spring effect that can happen with a metal hose. The Aventadorís transmission moves the odd- and even-numbered gears to different shafts (as in a dual-clutch automatic), so that one gear can be engaged while the other is being disengaged, ensuring the absolute minimum amount of time that a gear is not engaged. To facilitate smoother shifting and better wide-open throttle performance, the Aventador can reduce engine spark in the middle of the shift; this briefly reduces engine torque and allows the gear change to happen with a reduced load on the gears and synchros.

Think that last sentence applies most to the TT-A and how the gearbox is holding up (especially since the car is producing gobs of TQ & that the gearbox was designed to reduce TQ during shifts). Hopefully we will see more of this TQ-reduced programming in future automated gearboxes to increase their shelf lifes & TQ ratings.